The Barska® GLX 5mW Green Tactical Laser Sight gives you increased targeting distance and tactical versatility. It emits a 532 nm green laser light beam for improved speed in target acquisition. Green light is known to be the most visible color light because of its sensitivity to the human eye and that tactical advantage is enhanced with windage and elevation adjustments for truly pinpoint accuracy. The rugged 1" aluminum tube has a tactical edge bezel and diamond cut exterior grip. The beam is controlled by either a continuous on/off switch or a momentary light cable.